Effect of orthogonal polarization control plate on polarization property of focus speckle

For the control of the polarization property and intensity uniformity of optical field near the entrance of the target chamber in indirect drive Inertial Confinement Fusion (ICF), two-dimensional spectral angular dispersion (2-D SSD), random phase plate (RPP), combined with orthogonal polarization control plate (OPCP) have been employed. Influence on the polarization property and intensity uniformity in and near the focal plane by using OPCP has been numerically simulated and theoretically analyzed, and the choice of the number of elements of OPCP has been discussed. The results show that OPCP with different number of elements exhibits different extent of influence on the polarization property and intensity uniformity of optical field in and near the focal plane, and that the polarization property of optical field is not sensitive to defocus. In addition, defocus will degrade the intensity uniformity more or less, but the effect would be reduced by appropriately increasing the number of elements of OPCP.